{
  "bibcode": "2007GCN..6117....1A",
  "body": "A. Arai, M. Uemura and T. Uehara (Hiroshima Univ.), \nreport on behalf of the KANATA GRB team:\n\n We perfomed optical imaging of the field of GRB070220 (GCN 6114) at \n9:59-10:20 UT 20 Feb. using TRISPEC attached to the KANATA \n1.5-m telescope at Higashi-Hiroshima Observatory, Japan.  \nWe obtained 10 Rc-band images with a 123-s exposure time.  \nThe images were calibrated with neighbor stars \nin the USNO A2.0 catalog  (r mag ).\n\nWe cannot significantly detect the optical afterglow \nat the position of the X-ray afterglow reported in GCN 6114 in our images. \nThe limit magnitude is estimated to be 21.2 (3-sigma).   \n\nUT                      Limit mag in Rc    Exp. Time\nFeb. 20.42381               21.2             123 * 10\n\n-------------------------------------------\n\u001b$B9-EgBg3X\u001b(B \u001b$BBg3X1!M}3X8&5f2J\u001b(B\n\u001b$BJ*M}2J3X@l96\u001b(B  \u001b$B9b%(%M%k%.!<1'Ch!&AGN3;R<B83\u001b(B\nD1 \u001b$B?70f\u001b(B \u001b$B>4\u001b(B(Arai Akira)\n-------------------------------------------",
  "circularId": 6117,
  "createdOn": 1171969227000,
  "email": "arai-akira@hiroshima-u.ac.jp",
  "subject": "GRB 070220: Observation with the KANATA 1.5m telescope",
  "submitter": "Akira Arai at Hiroshima U  <arai-akira@hiroshima-u.ac.jp>",
  "eventId": "GRB 070220"
}